CHEMICAL REACTION ENGINEERING QUIZ

Which of the following is a controlling factor in very fast heterogeneous reaction?

Heat and mass transfer effects

Composition of reactant

Temperature

Pressure

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In the converter of the contact process for the manufacture of H₂SO₄ the equilibrium conversion of SO₂ (i) with increase in temperature and (ii) with increase in the mole ratio of SO₂ to air.

(i) decreases (ii) decreases

(i) increases (ii) increases

(i) decreases (ii) increases

(i) increases (ii) decreases

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Brunaur, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation?

None of these

The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process

Langmuir

There is no dynamic equilibrium between successive layer

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For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min⁻¹ . What will be the conversion for a PFR with a space velocity of 0.2 min⁻¹? Assume that all the other operating conditions are the same for CSTR and PFR.

0.15

0.3

0.6

0.9

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Signal normally used to study non-ideal flow by stimulus response technique is __________ input.

Both A & B

Pulse

Neither A nor B

Step

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The ratio of volume of mixed reactor to the volume of P.F.R. (for identical flow rate, feed composition and conversion) for zero order reaction is

1

∞

> 1

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Given, 3H₂ + CO = CH₄ + H₂O, KP = 101.84 and, 4H₂ + CO₂ = CH₄ + 2H₂O, KP = 101.17the KP for the reaction CO + H₂O = CO₂ + H₂ is

10-3.01

103.01

L00.67

10-0.67

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For a homogeneous reaction of nth order, the dimension of the rate constant is given by

(concentration)1 - n/(time)

(concentration)n - 1/(time)

None of these

L/(time)n

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The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is

3

2

0.5

1

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Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k₁/k₂).Csub>Aa-b

Use CSTR with a high conversion, when a > b

Avoid recycle, when a > b

Use batch reactor or plug flow reactor, when a > b

Use high pressure and eliminate inerts, when a > b

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